A.M. Edition for Sept. 25. Multiple drones flew over airports and a military base housing most of the country's fighter jets, with Denmark’s government calling the hybrid attack a threat to freedom and safety. Plus, the White House is planning for mass firings if there is a government shutdown next week. And, Delta is upgrading plane engines that are often behind toxic fumes leaking into the air supply on flights. But WSJ aviation reporter Ben Katz explains why the airline’s effort won’t entirely stop the risks. Caitlin McCabe hosts.

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